Ignition coil



April 1929- w. A. CHRYST 1,710,862

IGNITION COIL Filed NOV. 21, 1927 6/ 74 23 272 5 63 5 27 1:1 :25 I & I I I I a a3 gr 8A? 3% I 00% 1 I r m m +4 winding 20 surrounded by secondary winding 21. These windings are previously- Patented Apr. 30, 1929.

UNITED STATES PATENT OFFICE.

WILLIAM A. OHRYST, OF DAYTON, OHIO, ASSIGNOR T0 DELCO-REMY CORPORATION, OF

, DAYTON, OHIO, A CORPORATION OF DELAWARE.

IGNITION COIL.

Application filed November 21, 1927. Serial' No. 234,632.

This invention relates to ignition coils for the ignition system of an internal combustion engine.

One object of the present invention is to facilitate the mounting of the ignition coil windings and the magnetic circuit therefor, and a cylindrical-type condenser within a housing; and to facilitate the connection of the terminals of the coil and of the condenser with the terminals which are mounted on the exterior of the housing.

Further objects and advantages of the present invention will be apparent from the 'following description, reference being had to the accompanying drawing, wherein a preferred form of embodiment of the present invention is clearly shown.

In the drawing:

Fig. 1 is a side elevation of an ignition coil.

embodying the present invention.

Fig. 2 is a longitudinal sectional View on the line 22 of Fig. 4.

Fig. 3 is an end view looking in the direction of the arrow 3 of Fig. 2, the end cover of the housing being removed. Fig. 4 is an end view partly in section, the end view being taken in the direction of the arrow 4 of Fig. 2 and the sectional View being on the line 44 of Fig. 2.

The coil assembly comprises a primary formed and impregnated with an insulating compound. The end turns of the layers ofthese winding terminate short of the margins 22 and 23 of the insulatingpaper wrapped between these layers of turns. The space within the coil 20 is filled with a magnetic circuit comprising a clamping bolt 24 and a number of relatively small iron wires 25. Between the head 26 of the bolt and the paper margins 22 there are clamped a non-conducting cup-shaped memberor end bell 27 a bundle of thin magnetizable laminations 28,

a non-conducting disc 29 having a radial slot.

cylindrical casing which surrounds the coil windings.

A nut 36 cooperates with a threaded part 37 of the bolt 24 to clamp against the core 25 and paper margins 23, an end bell 27 and a bundle of laminations 28 including a retaining lamlnation 28, and an insulating lamination 29. The threaded extension'of the rod 24 extends through a non-conducting cover 40-for the housing 35 and a nut 41 cooperates with the threaded extension 37 to secure the cover 40 in position. Likewise, the lamination 28 adjacent the right hand end'ot the 0011 assembly is provided with cars 32 by which the laminae 28 are attached by rivets 33 to the housing 35. In this way the assembly of core and windings is fixed within the housing 35 without the use of a filler of lnsulatmg compound such as hydrolene.

The other end of the case 35 is closed by cover 42 which is attached by screws 43 passing through plain holes in the cover 42 and taip ped holes 44 in ears 45provided by brackets 46 which are attached to the case 35 and:

to exterior supporting brackets 47 by rivets 48. The brackets 47 are integral with a yoke plate 49 attached by'spot welding to a base plate 50 carrying stud 51 by which the base plate 50 may be attached to a-suitable support. That end of the coil case 35 which is adjacent the cover 40 is likewise attached by rivets 48 to supporting brackets 47 inte 'ral with a yoke plate 49 attached by spot welding to base plate 50. I The outside lead 60 of the secondary 21 is connected with a bolt 61 which is clamped by a nut 62 to a plate 63 attached by a rivet 64 to the case 35; The bolt 62 is shaped to receive a suitable terminal clip by which the secondaryterminal 60 may be attached to an igmtion distributor. The inside lead 66 (see Fig.4) of the secondar .21 is grounded by passing it through one o the rivets 48 which 1s tubular and soldering it to the rivet so as to make an electrical connection with the supporting bracket of the coil assembly.

Referring to Fig. 3, the outside lead 70 of the primary 2.0 is attached to the clip 31 and solderedthereto'. The clip 31 is prevented from turning by providing it with a lug 31 received by the radial notch 30 of the non-conducting plate 29. Hence the rod 24 providesa conductor extending from the outside: lead of the prima 20 and to the exterior of the coil assembly t rough the cover'40. The inside 110" lead 71 of the primary passes through a tubular rivet 72-which secures to the case 35 a terminal bracket 73 cooperating with a terminal screw 74 by which the rimary coil may be connected with the positive contact of the circuit interrupter or timer. A rivet 75 secures to the case 35 a terminal bracket 76 00- operating with a screw 77 for the purpose of making a connection with the negative side of the ignition circuit.

The space between the cover 42 and the adjacent end of the winding'and core assembly within the case- 35 .encloses a condenser 80 having insulated foil strips wound upon a metal core 81 and surrounded by a cylindrical case 82. This condenser is the subject matter of a copending application' of Robert H. Ahlers, Serial No. 702,461, filed March 27, 1924 and is so constructed that one of the foils is electrically connected with the core 81 which is insulated from the case 82 and so that the other foil is electrically connected with the case 82. A rivet 83- secures to the case 82 a metallic bracket 84 by which the condenser is supported within the case 35 and by which one of the condenser foils is connected with a'bracket 76 by a. screw 85 passing through aligned plain holes in the bracket 76 and case 35 and having threaded engag ment with the bracket 84. The condenser is rigidly supported within the case 35 and is electrically connected with the terminal bracket 73 by a screw 86 which passes through aligned plain holes in the bracket 73 and case 35 and threadedly engages a ta ped hole 87 in the core 81. In this way a con enser is connected across the ignition line and in shunt with the contacts of the ignition timer.

The condenser may be easily replaced by removing the cover 42 of the case 35 and then removing the screws 85 and 86. The bolt 24 with which the outside lead of the primary 20 is connected is electrically connected with the terminal of a battery or other current source through an ignition resistance unit comprising a. resistance coil 90"supported by a non-conducting spool 91 and attached at one end to terminal plate 92 and atthe other end to a cup-shaped terminal disc 93. These members together with a. nonconducting plate 94 and a metal locating plate 95 are held together by tubular rivet 96 which is electrically connected with the disc 93 and therefore provides one of the terminals of the resistance unit. When the rivet 96 is passed over the threaded extension 37 ofbolt 24 and is clamped againstthe nut 41 by a nut 97, an

. electrical connection will be made between the bolt 24 and the plate 92 and hence between .the primary winding 20 and a terminal screw 98 which threadedly en the plate 92. The locating plate 95-tis provided with ears 95'extending adjacent 'theflat sides of the I nut 91.s0-as to limit rotation of the plate 95 to the nut. The plate 95 provided with an ear 95 received by a hole in the insulating plate 94, and the insulating plate 94 is provided with a flat surface engaged by a lug 92 provided by the terminal plate 92. In this way the parts of the ignition resistance 1 unit are prevented from turning relative to each other and to the nut 41.

The primary lead wires and the inside secondary lead are brought out through nonconducting bushings 100 which ass through aligned holes in the end bells 2i and the assembly of laminations 28, 28 and 29. The

bushings 100 provide for fixing the location of the laminations 28 relative'to the windings and hence the relation of the supporting cars 32 otthe laminations 28 relative to the secondary lead 60. Then when the coil winding and core assembly is attached to the case 35 by the cars 32, the secondary lead 60 will bev located properly with respect to the terminal bolt 61.

While the form of embodiment of the present invention as herein disclosed, constitutes" a preferred form, it is to "be understood that other forms might be adopted, all coming within the scope of the claims which follow.

What is claimed-is as follows:

1. An ignition coil comprising windin s, a magnetizable structure supporting the w1ndings and comprising sheet metal bodies at the ends of the windings, a tubular non-magnetizable case, and means for attaching the sheet metal bodies to the case. 1

2. An ignition coilcomprising windin a central magnet core extending through the windings, magnetizable laminae located at each end of the windings, certain of the laminae having apertured cars, a tubular nonmagnetizable case, and rivets for securing the ears to the interior of the case.

3. An ignition coil and condenser unit comprising a tubular case, coil windings located within the case, terminals on the exterior of the case and connected through the case with the coil windings, condenser within the case, and a screw for attaching the condenser to the case and for making an electrical connection with one of said terminals.

. 4. An ignition coil and condenser unit coniprising a tubular case, coil windings located within the case, terminals on the exterior of the case and connected through the case with the coil windings, a cylindrical condenser having a conductfoil strips, one of w 'ch is electrically connected with a central metal core insulated 5. An ignition coil and condenser unit comprising a tubular case, coil located" case having insulated Within the case, terminals on the exterior of the case and connected through the case with the coil windings, a cylindrical condenser having a conducting case and having insulated foil strips, one of which is electrically connected with a central metal core insulated from the condenser case and the other of which is electrically connected with the case, means for supporting the condenser at both of its ends within the coil case, one end of the condenser being attached directly to one of the terminals of the coil case by a screw threadedly engaging the condenser core, and the other end of the condenser case being att-ached directly to a bracket which is attached 1 by. a screw to another terminal on the coil case.

6. An ignition coil comprising a core supporting wlndings, a case supporting the core, a bracket supporting the case, a bracket within the case and attached to the case by the rivets attaching the first named bracket to the case, an end cover for the case and a screw for attaching the end cover to the second named bracket.

In testimony whereof I hereto altix my signature.

WILLIAM A. OHRYST. 

